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Izidor Hafner
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Demonstrations 21  40 of 821
200 Stars Projected to the Sphere and Platonic Solids
Venn Diagrams and Syllogisms
Rolling a Polygon on Another Polygon
Duffin's Sequence for Pi
Rolling a Regular Polygon on the Unit Circle
The Spherical Patterns for Point Groups
Rolling a Cube on a Small Rhombicuboctahedron
Dissection of a Regular Enneagon into Four Congruent Regular Enneagons
Overlapping Volcano Unfolding of a Prismoid
Dissecting a Regular Hexagon into Five Congruent Regular Hexagons
Varsady's Dissection of a Regular Pentagon into Six Congruent Regular Pentagons
Dissection of an Equilateral Triangle into Five Equilateral Triangles
Rolling a Regular Dodecahedron on a Congruent Dodecahedron
Frederickson's Dissection of a Regular Dodecagon into Two Congruent Regular Dodecagons
Theobald's Dissection of One Regular Octagon into Two
Basis for a Topology
Kakeya Needle Problem
Frederickson's Second Dissection of an Octagon to Five Octagons
Proposals for Medals for the Tokyo 2020 Olympic Games
Frederickson's Hinged Dissection of Five Decagons to One
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